EFSA clarified that tea infusions such as those used for brewed tea are still considered free from harm as it typically only contains 90-300 mg. On the other hand, instant tea drinks just contain lower levels of the antioxidants present in natural green tea.

EFSA warns that too much consumption of these antioxidants can be harmful too. They added that most supplements provide an intake of 5-1000 mg which is beyond what is safe to take. Thus, high amount of green tea antioxidant properties may have a harmful effect on the liver.

European researchers said that consuming over 800 mg per day led to higher health risks.

EFSA has yet to confirm what the safe dosage is for green tea supplement intake.